- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Self-error-rejecting quantum state transmission of entangled photons for faithful quantum communication without calibrated reference frames
摘要： We propose an alignment-free two-party polarization-entanglement transmission scheme for entangled photons by using only linear-optical elements, requiring neither ancillary photons nor calibrated reference frames. The scheme is robust against both the random channel noise and the instability of reference frames. Furthermore, the success probabilities for entanglement transmission are, in principle, improved to unity when active polarization controllers are used. The distinct characters of a simple structure, being easy to implement, and the high fidelity and efficiency make our protocol very useful for long-distance quantum communications and distributed quantum networks in practical applications. As an example, we give its application in a reference-frame-alignment-free quantum key distribution protocol with entanglement.
关键词： quantum communication,quantum key distribution,entanglement transmission,polarization-entangled photons,linear-optical elements
更新于2025-09-16 10:30:52
-
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
摘要： We present a high-performance source of unconditional polarization-entangled photons that have a high-emission rate, a broadband distribution, are degenerated and postselection free. The property of the source is based on the multiple quantum interference effect with a round-trip configuration of a Sagnac interferometer. The quantum interference effects make it possible to use the high generation efficiency of the polarization-entangled photons to process parametric down-conversion, and separate degenerated photon pairs into different optical modes without a postselection requirement. The principle of the optical system was described and experimentally used to measure the fidelity and Bell parameters, and also to characterize the generated polarization-entangled photons from a minimum of six combinations of polarization correlated data. The experimentally obtained fidelity and Bell parameters exceeded the classical local correlation limit and are clear evidence of the generation of unconditional polarization-entangled photons.
关键词： type-0,round-trip configuration,Sagnac interferometer,type-II,parametric down-conversion,Polarization-entangled photons,Engineering,Issue 151,quantum interference
更新于2025-09-11 14:15:04